Not surprising with blown fuses because 1.6 A is adapted for 230V. I recently got an amp for 230 V use in Europe and the text on the back of the amp is updated with: 115V/3A * 230V/1.6A Nothing special with that, this is the case for all equipment . If you use half the voltage then the current...

Interested, but not completely sure I can come.

Yes, that is interesting and I am waiting for the result.

It's very easy if you hear two tones after another but more difficult with a single tone. I have a CD with test tones (sinus tones) for speakers and listened to 100 and 50 Hz. I have another amp for the speakers and compared not directly but the slight hum I can hear from Leben should be 50 Hz...

It certainly has a higher noise floor than modern SS amps.

Quote:   It you really want to destroy your ears you could try with 20 ohm resistors for higher output!   Congratulations to the improvements! I didn't say that a choke removes humming and only asked my tube guru about it and he said that it is a good idea and it reduces noise. I...

Looks like Duelund capacitors, the big ones in the picture are very expensive!  

Thanks Raaf and BugleBoy! Looking closer at the picture I can see that it is a plate and not a box. I thought that was some goodie in the box that you only get with the X model. It is not so but there are still a few components of higher quality in the X model.

Quote:   I assumed it was a choke because it has been said that there is a choke in the CS300X model and there is no such box in the CS300. In the CS300 there is no box as in the picture I published and neither the resistors on you picture. Is the box just a cover for the resistors or...

The choke on the CS-300X is located in the upper section of the amplifier, between the power supply and the transformers. I don't know how it is connected and the circuit, but it is probably wired differently than Raaf's choke.  

I spoke with my tube amp guru today, he has a long experience of designing and repairing tube amps. He didn't believe that driving HE-6 direct from the speaker outputs would damage the amplifier, but could not give a guarantee. He said that it is safe with a parallel resistor and also could be...

I also believe that the distortion depends on the power demand of HE-6.   Please tell us what Leben say about driving headphones on the speaker outputs. It has been reported earlier that the power is enough for HE-6 but the impedance mismatch could possibly damage the transformers. That is...

There are certainly better tubes than Golden Dragon but you should not get different results with other tubes regarding output and distortion, or only marginally. 5751 has a lower gain than ECC83 but the difference is not great. It is not sure that the amplification will be lower with 5751...

Yes, that is obvious but it is total sound quality when playing music that counts. Those quiet listening sessions seem mostly to make people nervous, especially those that are not used to the noise level of tubes and vinyl and using SS and digital as reference. Leben is either not the most quiet...

007t has a switch but input 2 works both as RCA and XLR and you must set the switch after what you use. 007t ii has three inputs and input three is only balanced according to the picture. This is a change that is more user friendly because many users have difficulty understanding the thinking...

HD800 works fine. Leben is not dead silent when no music is playing, at least with most headphones. I don't understand why that is so important, I never listen to it without music. It is known that the headphone out is not powerful enough for HE-6 (I have never tried but documented earlier in...

Nice!   Do you have any source/link to the pics?   Quote:

Quote: The same tube dampers that worked in many other cases. People sometimes talk about about overdamping, I don't know if there is a strict definition of the concept or if it just means that the tubedamping doesn't give the desired result. Probably, different persons also have different...

I have positive experience of tube dampers but never have had that much hum. They usually have most effect on the input tubes. Herbie's Audiolab makes good tube dampers for most sizes of tubes. Sometimes the effect is negligible or even to the worse, as decreased airiness.

BugleBoy, congratulations that your problem is solved. It is useful to know that hum problems can depend on a damaged resistor and can be a good idea to check for those who have disturbing hum. My resistors and other components had no visible damage when I looked last time, and I have no...

As some of my previous posts were copied by ardilla, just a comment about the hum that disappeared after a resistor change. That is very hard to understand if the resistor was not already damaged by previous tube problems or something else. I don't say that that this apply in this case, but I...

Quote: My intention was not to start a new discussion on break-in, rather that that discussion was pointless because much of it was based on listening impressions of headphones that already had been played for 2 weeks (more than 300 hours).

Very interesting reading and also some unexpected information, at least for me. There have been some rumors about a new top of the line amp, but now it is confirmed. There have been discussions about the possibility of break-in of electrostatic headphones. Now we get the information of a one +...

Agree, I also like the 007t, especially with HE60 and small ensemble acoustic music. It has a special charm. BHSE is better but I still think that 007t is a good amp. Bass-heavy music with O2 is not the strong side of 007t but there are other aspects.

Quote: I think I have to agree on this, CS300 is noisiest amp I have, also among tube amps. That said, I haven't had any problem with hum with my normal sensitivity headphones. Perhaps it is because it is a 12/15 W amplifier that the ground noise becomes high. It is not important to me...